About the Kalf Thermal Knee Warmers Think of how a body moves while pedaling. It\\\'s no surprise that knees are something special and need to be looked after. Hold the KALF knee warmers up and you\\\'ll notice the anatomical bend designed into the warmers to reduce ruching behind the knee. The KALF Thermal Knee Warmers use premium Italian Roubaix fabric, brushed on the inside for insulation and comfort, to keep the synovial fluid in your knees warm and your joints protected from pedaling in the cold. The knee warmers remain securely in place with silicone grippers on the top hem. For changeable weather and fluctuating temperature, rest assured that with KALF\\\'s Thermal Knee Warmers, your knees are well cared for.